main: use yansi::whenever

Cargo.lock

@@ -261,6 +261,12 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
+[[package]]
+name = "hermit-abi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f154ce46856750ed433c8649605bf7ed2de3bc35fd9d2a9f30cddd873c80cb08"
+
 [[package]]
 name = "indexmap"
 version = "2.9.0"
@@ -271,6 +277,17 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "is-terminal"
+version = "0.4.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e04d7f318608d35d4b61ddd75cbdaee86b023ebe2bd5a66ee0915f0bf93095a9"
+dependencies = [
+ "hermit-abi 0.5.1",
+ "libc",
+ "windows-sys",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
@@ -364,7 +381,7 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi",
+ "hermit-abi 0.3.9",
  "libc",
 ]
 
@@ -697,3 +714,6 @@ name = "yansi"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
+dependencies = [
+ "is-terminal",
+]

Cargo.toml

@@ -19,5 +19,5 @@ thiserror = "2.0"
 anyhow = "1.0"
 jiff = "0.2.13"
 clap-verbosity-flag = "3.0.2"
-yansi = "1.0.1"
+yansi = { version = "1.0.1", features = ["detect-env", "detect-tty"] }
 derive_more = { version = "2.0.1", features = ["full"] }

src/main.rs

@@ -50,6 +50,8 @@ enum Command {
 fn real_main() -> anyhow::Result<()> {
     let cli = Cli::parse();
 
+    yansi::whenever(yansi::Condition::TTY_AND_COLOR);
+
     env_logger::Builder::new()
         .filter_level(cli.verbosity.log_level_filter())
         .format_timestamp(None)